Check
Verify the operating system initiates an action to notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity.
Check the system configuration to determine the partition the audit records are being written to with the following command:
# grep -iw log_file /etc/audit/auditd.conf
log_file = /var/log/audit/audit.log
Check the size of the partition that audit records are written to (with the example being "/var/log/audit/"):
# df -h /var/log/audit/
0.9G /var/log/audit
If the audit records are not being written to a partition specifically created for audit records (in this example "/var/log/audit" is a separate partition), determine the amount of space other files in the partition are currently occupying with the following command:
# du -sh
1.8G /var
Determine what the threshold is for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached:
# grep -iw space_left /etc/audit/auditd.conf
space_left = 225
If the value of the "space_left" keyword is not set to 25 percent of the total partition size, this is a finding.